If the picture is what it looks like it is the cooling fins for the electronic module on an electronic distributor.
It's not an ECU - just a (more accurate) substitute for a set of contact breaker points.
it works just like an old distributor with a set of contact breaker points to feed the ignition coil, but it uses a 4 pole magnet, a coil, and an electronic module to provided the current to the coil.
I'm sure someone will say the pick-up is a "Hall effect" device, but in this application it is a coil.
With this controlling your ignition you either have a carburettor controlling the fuel/air mixture, or you might just have a Bosch Mono-jetronic fuel injection system* (which controls fuel injection only - unlike newer systems which do both ignition and injection).
Regards
John H
* the Panda used this system for a few months only in early 1993 - like mine...